When to plant Cauliflower in Cool Australia

Cool zone — applies to Hobart, Canberra, Ballarat, Orange, Armidale and similar areas. Growing elsewhere? Temperate · Subtropical · Tropical · Arid.

In the cool zone, sow cauliflower direct from February to May, with a second chance in August and September. It is the marathon runner of the brassica bed — allow 100–160 days from sowing to a cut curd — so the late-summer window suits gardeners in Armidale or Ballarat aiming for winter and early-spring harvests. Sow 6 mm deep and give each plant serious room: 45–70 cm apart, in rows 75–90 cm apart. Cauliflower rewards patience and steady conditions, and punishes neglect more sharply than any other brassica.

Sowing calendar — cool zone

Green months are your sowing window: February to May and August to September.

Growing notes

Cauliflower is frost hardy, and in the cool zone that hardiness is the whole strategy: February-to-May sowings grow through autumn and stand through winter frosts in Canberra or Armidale, maturing when little else is producing. The nuance is that while the plant tolerates frost, a developing white curd can be marked by hard freezes and by winter sun — bend a couple of outer leaves over the curd once it reaches golf-ball size to keep it blanched and protected. August and September sowings are quicker off the mark but must reach maturity before summer heat, which is a tight run at 100–160 days; choose faster varieties for that window.

Soil should be firm, deeply fertile and limed to around pH 6.5–7 — cauliflower is the hungriest brassica and sulks in acid or lean ground. Never let it dry out; even one hard check produces the classic cool-climate failure, ricey or button-sized curds that never bulk up. Steady water and a fortnightly feed are the fix, alongside sowing at the right end of the window for your variety.

Cabbage white butterflies find cauliflower as readily as cabbage, and autumn sowings coincide with their late-season peak — exclusion netting over hoops from sowing day is the dependable defence, and it doubles as light frost protection for young seedlings.

Cauliflower at a glance

Companion planting

Grows well with

Nasturtiums: Trap crop; deters cabbage white butterfly

Marigold: Deters aphids and cabbage moth

Common questions

When should I sow cauliflower in the cool zone?

Sow direct from February to May for the main winter-maturing crop, or in August and September for a spring sowing that must finish before summer heat.

Why are my cauliflower heads small and grainy?

Ricey, undersized curds come from any check to growth — drought, poor soil or transplant shock. Keep water and feeding absolutely steady from sowing to harvest.

How long does cauliflower take from seed?

It is a long-haul crop: 100–160 days from sowing to harvest, which is why autumn sowings that stand through winter are the mainstay in cool climates.

Should I cover the white heads on my cauliflower?

Yes. Once the curd is golf-ball sized, fold a few outer leaves over it. This blanching keeps the curd white and shields it from hard frost and winter sun.

Keep exploring